function showFeature(feature) {
	var panel = document.getElementById("panel"+feature);
	var divSet = document.getElementsByTagName("DIV");
	for (var divNo=0;divNo!=divSet.length;divNo++) {
		if (divSet[divNo]!=panel) {
			if (divSet[divNo].id.match("panel")) {
				divSet[divNo].style.display="none";
			}
		}
	}
	panel.style.display="block";
}